Final answer:
In a distal radius fracture, the palmar radiocarpal ligament and long radiolunate ligament are primarily involved in restoring the palmar tilt through ligamentotaxis. The brachioradialis also contributes due to its traction force on the distal radius.
Step-by-step explanation:
In the context of a distal radius fracture, ligamentotaxis refers to the process of using the tension of ligaments to aid in realignment and stabilization of bone fragments. The palmar tilt, which is generally about 11 degrees in the radius, is essential for proper wrist function and is often disrupted during these fractures.
The ligaments that contribute to the restoration of the palmar tilt through ligamentotaxis are mainly the radiocarpal ligaments, including the palmar radiocarpal ligament and the long radiolunate ligament. While not directly at the wrist, the brachioradialis may also play a role due to its insertion on the distal radius, as it can exert a traction force helping in alignment.
The joints involved, chiefly the radiocarpal and the midcarpal joints, articulate to allow movements of the hand at the wrist. These ligaments hold the carpal bones together and contribute to maintaining the stability of the wrist and facilitating the correct alignment and healing of the distal radius fracture.